Ok, what I stated about my friends comment was totally wrong. On my part I misunderstood what he said. He said that ANY API-SN-ILSAC-GF-5 motor oil can be used in the 3.5 Navi engine. He stated that "HE" would use MC 5W30 semi-synthetic in the DI engine, changing it EVERY 3K miles. He also stated that the Navi gets complimentary OCI's for the first 2 years (that's what his dealership offers). If my cousin is changing his own oil that he must have opted out of the complimentary OCI's. I asked my cousin and he stated that he did because the dealership is 102 miles away.
About the wrong oil in the engine statement, he stated that he has NEVER seen a warranty claim for an engine failing from the wrong spec'd oil. His shop DID deny a warranty claim on an F150 differential due to the wrong weight gear lube without friction modifier being added. The NOACK statement was mentioned about 15% or something like that. I sure hope all of this is correct, or, makes sense. I might have stated something wrong, or, out of order here. All I was asking was an opinion on the OCI for my cousin's Navi. I didn't know I would wind up this deep into something so trivial to me. Flame me, beat me, mock me, I don't care any more. I did what I could to get answers for the technical guru's here and will just leave it at that.